Ceiling Unit -- Ducted Systems, Filter Removal

3.4 CEILING UNIT -- DUCTED SYSTEMS

The filters (Figure 3-9) are located in the ceiling grill. To remove the filters, do the following:

a. Grasp the edge of the filter at recess in the end of the ceiling grill.

b. Pull filter completely out of the filter slot.

c. Vacuum filter or wash filter in luke--warm water. Shake off excess water and dry thoroughly.

d. Replace filter by sliding the filter into the filter slot in the ceiling grill until the filter frame is flush with the in- terior grill.

Filters

Operation Indicators

To remove the ceiling grill (Figure 3--10) do the following:

a. Before working on unit place the master switch in the OFF position and disconnect all electrical power.

b. Remove filters (Refer to paragraph 3.4.1).

c.Remove 4 screws located on the ceiling grill, (two are under the filters) making sure to support the weight of the grill.

d.Lower the ceiling grill from the ceiling panel.

e.To replace the grill, place the grill up against the ceil- ing panel and align the screw holes in the grill with the ceiling panel.

f.Replace 4 screws and 2 filters.

To remove the control box assembly (Figure 3-11 & Figure 3-12) do the following:

a. Remove ceiling grill. Refer to paragraph 3.4.2.

b. Disconnect 115 volt (AC) and 12 volt (DC) power wires.

c. Remove two screws securing control box cover to control box assembly. See Figure 3-11.

d. Remove control box assembly cover.

Mounting Screws

e. Disconnect blue furnace wires.

f.Unplug two connectors from upper unit.

g.Unplug DC power plug #1 (red/yellow/black wires) See Figure 3-12

h.Unplug relay signal plug #2 (brown/red/orange/ yellow wires). See Figure 3-12

i.While supporting control box assembly remove two screws securing control box assembly to ducted ceil- ing unit.

j.Pull control box assembly from the ducted ceiling unit.

k.Reverse above procedure to reassemble.

Control Box

Cover Screws

Fuse

PCB Cover

Screws

T--298

3-4